FIGURES 12–18 in Taxonomy of three new Neidium Pfitzer species of the Arapiuns and Tapajós Rivers Basin (Santarém, Pará, Brazil)

FIGURES 12–18. Neidium borari in SEM. Fig. 12. General external valve view. Fig. 13. Triangular lacinia that cover the distal raphe endings. Fig. 14. External view showing proximal raphe endings straight with drop-like shaped. Figs. 15, 17. Internally, distal raphe endings showing a prominent helictoglossae. Fig. 16. Proximal raphe endings form loosely interconnected ribbed nodules and evident renilimbi around areolae (arrows). Fig. 18. General internal valve view. Scale bars: Figs. 12, 18 = 10 μm; Figs. 15 = 5 μm; Figs. 13, 14, 16, 17 = 2 μm.